Improvement in feed-screws for drills



UNITED STATES PATENT OFFICE.

JOHN B. WHITE, OF JOPLIN, MISSOURI, ASSIGNOR OF ONE-HALF OF HIS RIGHT TOJOHN BLACK, OF AURORA, INDIANA.

IMPROVEMENT IN FEED-SCREWS FOR DRILLS.

Specification forming part of Letters Patent No. 222,972, dated December23, 1879; application filed August 6, 1879.

To all whom it may concern:

Be it known that I, JOHN B. WHITE, of Joplin, in'the county of Jasperand State of Missouri, have invented certain new and useful Improvementsin Telescopic Extension Feed-Screws for Drills, of which the followingis a specification.

Figure l is a view, in vertical central section, through the feed-screwas extended. Fig. 2 is a like view, the parts closed in;

This invention relates to that class of feedscrews for drills in whichthe several parts telescope the one in the other; and it consists, moreparticularly, in providing the several sections .with a screw-thread,externally or internally, or both, and suitably provided with internalbraces or shoulders, whereby all the other parts or sections can bebrought within the first or largest section, or the en tire deviceextended to near the length of the several parts or sections, and in anyposition held firm and true without oscillation, all as will now be morefully explained.

In the accompanying drawings, A represents the main or largest hollowsection of the feed screw. The ratchet or operative parts and the drillare applied in any usual way to the lower end. Its inner periphery isscrew-threaded, as shown at a, and on this screwthread the second hollowsection, B, can be moved in or out by means of the screwthread 1; on itsoutside near the lower end. This section, B, in turn carries on itsinside screw-thread, 1), another section, 0, which is constructed likeB, and can have in it a like motion in or out of B, as that section canhave, as above described, in or out of section A. On the inside of B,near its upper end, is the annular shoulder I)", which fits close uponthe periphery of section G, and serves to steady and brace the saidsection at whatever point it may be in the section B. In like manner, ifdesired, section A may have such a shoulder or brace on its inside nearthe upper end. The next section, D, with its exterior and in-' teriorscrew-thread d and d, and its brace or shoulder cl, is of likeconstruction as B or O, and designed to work inside 0 on thread 0. Inits turn section D carries inside it section E, which is similar tosections B, O, or D, and has screw-threads e and e and brace-shoulder c.This section E in its turn carries on its interior screw-thread e thefeed-spindle F,

which is screw-threaded at f, and stayed and braced by shoulder a" ofsection E. 1

In putting this device together, the spindle F, without its head or top,is inserted in the section E, and said head afterward placed in positionand attached to the spindle F. The interior rings, 0, are soldered onthe lower ends of the sections, as shown on sections B O D, after eachsection has been inserted in its containing section, to prevent theseveral sections from being separated from each other.

While I now show the device as made in six several parts or sections, itis evident that it can be made with less or more, as occasion may renderexpedient.

As thus made and constructed, this device, when telescoped, can beapplied in a very small or narrow space, and again, on occasion, can beextended to a "cry considerable length without loss of strength or truehearing, since the several parts or sections are so securely held theone within the other, and braced the one upon the other, that there canbe no vabbling or oscillation, and the whole device, as an individualand single piece, will remain firm and truly straight. Moreover, theentire device is very simple in its structure, as well as inexpensive,and cannot easily get out of order.

I am aware that screw-threaded tubes telescoping one within the otherhave heretofore been employed, and I therefore lay no claim to suchinvention, broadly; but I am not aware that telescopic tube-sections,screw-threaded externally and internally, as set forth, and

provided with shoulders at their upper ends,

have heretofore been employed.

I claim- A telescopic feed-screw for drills, consisting of the sectionsB O D E, externally and internally screw-threaded, as set forth, andprovided with the shoulders I) 0 d, and lower internally screw-threadedsection A and spindle F, substantially as described, and for the purposeset forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

JOHN B. WHITE.

Witnesses S. 0. PRICE, CLARK CRAYCROFT.

